I am planning to buy a 1GB or 512mb nvidia geforce 9500 gt graphics card for my pc soon
Don't. Save up the money and get a 4830. Minimum, get a 4670 which beats the 9500GT by a fair ammount. See:http://www.anandtech.com/video/showdoc.aspx?i=3405&p=7
Considering that the 9500GT is ~$60-65 (before MIR), the 4670(~$60 after MIR; $70 before MIR) is a very good price vs. performance option. Prices based off of Newegg's current prices.